Staple feed mechanism for stapling machines



Patented June 20, 1950 STABLE FEED MECHANISM Fon s'rArLlNG I MACHINESlllathaniel M. IOlney, New York, N. Y., assignor to Speed lrloductsrCo., Ina, Long Island City, i

N. Y., a corporation l Application June 4, 1946, serial No?. 674,325

This invention is directed to stapling machines and specifically dealswith an improved and servceable staple propelling device or follower vina stapling machine wherein a `magazine appropriately sustains a `stripof wire staples and wherein self retracting manually `controlled`slidably guided plunger means Vis utilized to sever and drive theforemost staple from the stack through suitable sheet material to befastened. The dominant object of the invention resides in the provisionof a novel staplepusher or follower within and shiftabile longitudinallyof the staple magazine andhaving spaced and posterior bearings fixedlyretaining a fulcrnm pin or stay for desirably maintaining one end of acoiled spring having another end connected tothe cover for the magazine.Another important object is realized in the 'provision 'of means4 topermit quick assembly of one 'end 'of the c'oiled'spring with the staplepropelling device orfollower. A further object is to provide a'simplified follower having spaced bearings for strazddling a terminalcoil of the helicoidal spring and for retaining an appropriate pinthreaded through the spaced bearings and the terminal coil. Anotherobject is concerned 'with rotatably sustaining the terminal coil on thestay or fulcrum pin. Other important aspects, advantages and functionaland structural features of the invention will appear from the followingdetailed specification considered in the light of the accompanyingdrawings wherein:

Fig. 1 is a longitudinal and vertical sectional view of a staplingmachine showing the slidably guided staple follower according to myinvention.

Fig. 2 is a horizontal sectional View on the line 2-2 of Fig, 1.

Fig. 3 is a transverse sectional view on the line 3--3 of Fig. 1.

Fig. 4 is a fragmentary perspective View of Fig. 1, however illustratingthe swingable cover in a partially opened position relative to thestaple carrying magazine.

Fig. 5 is a perspective view of the follower, and

Fig. 6 is a perspective View of the slotted staple supporting rail.

The stapling machine generally designated S is characterized by themagazine M appropriately carrying the xed rail R on which a strip of:vire staples W are slidably guided. rEhe vire staple strip is of theconventional inverted U-shaped form and foremost staple as il! isadapted to be ejected through a vertical staple guideway 0r gap ll'between the front wall I2 of thecover C and front face l 3 ofthe rail bya verticallyslida'bly guided blade fill of the spring controlledvertically and. slidably guided driver s. D having" attached 'theretothe manipulatable head l5. y Attached: tothe driver and cover is anormally contracted Ybut extendible helicoidal spring I3 'fornor-mall'yfholdingthe driver elevated. f

'The cover C is pivotally mounted on 'the fulcrum pin P Icarried by themagazine M. 'Also pivoted on the `cover are the spaced upstanding lugsI1 projecting from the bas'eVB carrying the anvil A which is providedlwith suitable clinching'indent I8.4 v

slidably guided by the cover is the latch L having themanipu'latableWings le extending laterally of the cover C.

Trained about the slidably guided latch L is the helicoidal spring "2|having one end fastened to alug 22 extending from the cover C.

A -pivoted clearing lfatch12'3r is yielding-ly sustained on the free endof the leaf spring 26'; having its anterior end secured by a rivet 25 tothe base B. The clearing latch is adapted to removably project intoopening 2t to removably interlock with the bottom' wall of the magazine.

The slidably guided latch L removably interlocks with the .fwalls of thetransversely alined notches 2l in the spaced wings 28 projectingupwardly from the sides of the magazine M.

The foregoing structure is more particularly set out in United StatesLetters Patent 2,311,643, issued to Stephen A. Crosby February 23, 1943.

According to the invention an inverted U- shaped staple propellingdevice or follower F is slidably mounted on the fixed rail or support R.Specifically the follower has its depending sides 30 slidably arrangedin the longitudinally disposed and spaced staple guide channels 3|formed by the sides of the cover and the sides of the magazine.

Anchored to the top wall 32 of the staple follower or pusher F is therivet 33 having an enlarged cylindrical portion 34 slidably guided inthe elongated longitudinally disposed rectilinear slot 35 in the topwall 36 of the rail.

Cooperating with the underface of the top wall 3S is a relativelyenlarged head or liange 3l to preclude involuntary separation of thefollower from the rail.

The posterior end of the slidably guided staple follower is providedwith the transversely alined spaced ears o1 bearings 3B adapted tostraddle terminal coil or eye 39 of the helicoidal spring 2 I. It willbe observed that the terminal coil 39 is bent substantially normal tothe body of the spring 2l.

A cylindrical fulcrum pin or stay 40 is threaded through the bores ofthe transversely alined bearings 38 and through the opening in theterminal coil 39. This fulcrum pin has its ends appropriately Xedlyanchored to the ends of'.

the bearings 38 to preclude dislodgement thereof. By the arrangementdisclosed, the terminal coil is rotatably sustained by the fulcrum pinand has adequate play to shift therealong in the matmeans carried bysaid bearing means and threaded through 4and rotatably surrounded by 1'::said'terminal coil.

ter of opening or closing of the magazine by the swingable cover.

On pivotally opening of the cover the lower' leg 4I of spring 2Iretracts the follower towards the rear of the magazine to permitmounting of av y p staple strip on rail R. On closing of the cover n leg4I urges the follower forwardly consequently driving the staple stripforwardly to present the foremost staple under the raised stapleejeoting blade I 4 of the driver D which if depressed causes the blade I4 to shift the foremost staple through the vertical guideways I I,through the sheet material (not shown) to be fastened and against theindentations I8 of the anvil for elinching the ejected staple in amanner well understood.

Of course when the driver D is depressed spring I6 is elongated and uponremoval of manual pressure on the head l5 the driver automaticallyretracts to position its blade I4 above the rail as indicated in Fig. 1awaiting to again sever a foremost staple of the staple strip.

Various changes may be made in the details of construction andarrangement of parts without departing from the spirit of the inventionor sacrificing any of the advantages thereof inherent therein.

I claim:

1. In combination, a staple magazine having a rail including alongitudinally disposed slot, a staple follower comprising a top walland spaced v`2. In combination, a staple magazine having a rail,including a longitudinally disposed slot, a l5 staple followercomprising a top wall and spaced depending sides moya-bly straddlng saidrail, pin

- means securedzto and depending from said wall and having a portionslidably guided by the Walls of 'said slot, a head carried by said pinmeans and coacting with said rail to preclude separation of saidfollower from said rail, spaced and hollow bearing means integral withand extending from the posterior portion of the wall of said follower, ahelicoidal spring having a terminal coil interposed between said bearingmeans, and fulcrum stay means carried by said bearing means and threadedthrough and rotatably surrounded by said terminal coil.

NATHANIEL M. OLNEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

